The config.xml defines which theme settings are available. If someone saves the theme settings, they are saved in the minified config.json file. With every new saving process, the file will be overridden.

Warp themes provide a separate config.default.json file, where the default theme settings are stored. This gives you the opportunity to restore your backend to the default settings and backup your own config.json file, making your settings update proof.

Note For a better overview, use the JSON Formatter - this will bring your minified file into easily readable markup.